Switch stand lock



April 3, 1934. 1 c. N. cox 1,953,153

SWITCH STAND Locx Filed Sept. 30. 1931 5 Sheets-Sheet l 1 4 INVENTOR. 73 a 9 2 cr/r. Cox:

6 BY M ATTORNEY.

April 3, 1934. Q N. cox 1,953,153

SWITCH STAND LOCK Filed Sept. 30, 1931 s Sheets-Sheet 2' INVENY'OR. Z4 ,2 Cf KCOK:

A TTORNEY.

April 3, 1934. c. N. cox

SWITCH STAND LOCK Filed Sept. 50, 1931 3 Sheets-Sheet 5 w w A INVENTOR.

'Cf/KC'oJc A TTORNEY.

Patented Apr. 3, 1934 PATENT UNITED STATES 1 Claims.

This invention relates to switch stand locks of the character set forth in my United States Letters Patent No. 1,612,7il1, and has for the primary object, the provision of an improved locking means for the securing plunger employed for locking the switch stand operating lever and which is so constructed that the plunger may be manually set in locking position without the use of a key and which cannot be released from the stated position until the proper key is employed.

Another object of this invention is the provision of means whereby the various parts of the lock may be removed for repair and replaced 1 without removing the device from the switch stand.

A further object of this invention is the provision of means for preventing the removal of the key from the lock until the plunger has been manually set in looking position, thereby obviating the danger of a person removing the lrey and leaving the device unlocked.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description .and accompanying drawings, in which Figure 1 is a fragmentary side elevation partly in section of a switch stand with a lock applied thereto and constructed in accordance with my invention.

Figure 2 is a side elevation illustrating the lock.

Figure 3 is a sectional view illustrating the same.

Figure 4 is a sectional view taken on the. line 4- -4 of Figure 2.

Figure 5 is a sectional View taken on the line '5-5 of Figure 4.

Figure 6 is a sectional View taken on the line 6--6 of Figure 2.

Figure '7 is a sectional view taken on '7--'7iof Figure 3.

Figure 8 is a sectional view taken on the line 8--8 of Figure 3.

Figure 9 is a sectional view taken on the line 9-9 of Figure 3.

Figure 10 is a plan view illustrating a sliding tumbler.

Figure 11 is a plan view illustrating a pivoted tumbler.

Figure 12 is a plan view illustrating a plunger frame.

the line (Cl. YO-77) Figure 13 is a perspective view illustrating another pivoted tumbler.

Referring in detail to the drawings, the conventional type of switch stand is indicated by the reference character A having the usual pivotally 601 mounted switch operating lever 13 provided With an eye C to receive a locking medium for retaining the lever B in a vertical position.

A look casing 1 is suitably secured to the stand A either by welding or by suitable fasteners and has a slot 2 in one wall thereof for receiving the end of the lever 35 having the eye C. The casing 1 is provided with a removable cover 3 suitably secured thereto and is provided with a key. opening 4 surrounded by a guard 5. A frame 6 is removably secured in the casing by fasteners 7 and includes an end member 8 and a side member 9. The end member 8 is located adjacent the slot 2 and in close proximity to the end wall 10 of the casing and said end wall 10 is provided with an opening 11 aligning with an open 12 which openings slidably receive a plunger 13. The plunger 13 is secured to a plunger frame 14 slidably mounted within the frame 6 in the walls of the casing 1 and comprises a plate 15 provided with an elongated slot 16 to receive a drill pin or key guide 17 formed integrally with one wall of the casing 1 and arranged in alignment with the keyhole 4. One end of the plate 15 has an anglarly disposed flange 18 to which the plunger 13 is secured and said flange is angularly disposed at one end to ei'tend parallel with one side edge of the plate 15 to provide a locking shoulder 19. A shank or stem 21] is formed integrally with the plate and extends through an opening in one of the end walls of the casing and has secured to its outer end a finger piece 21 surrounded by a guard flange 22 formed on the casing 1. Interposed between the flange 18 and the member 8 of the frame 6 and mounted upon the plunger 13 is a coiled spring 23 adapted .to normally urge the plunger 13 out of the opening 11 and from across the slot 2 or in other words to disengage said plunger from the eye C of the lever 13 when the lock is actuated through the medium of a key.

A bracket 24. is carried by the casing 1 within the frame 6 and slidably supports slidable tumblers 25 arranged in parallelism with each other and which extend across the plate 15 of the plunger frame and through slots formed in the member 9 of the frame 6 and are engaged by leaf springs 26 carried by the frame 6. Ihe tumblers are provided with aligned notches 2'7 to receive the shoulder 19 of the plunger frame for permitting said plunger to move into an unlocked position. The tumblers 25 are provided with curved surfaces 28 to be en aged by the bit of a key 29 for the purpose of sliding the tumblers in one direction against the action of the leaf spring 26. The tumblers 25 are provided with notches 30 to be engaged by tumblers 31 pivoted to the bracket 24 and disposed at an opposite side of the key guide 17 from the tumblers 25. The tumblers 31 are provided with projections 32 adapted to engage within the notches 30 to prevent the tum blers 25 from having sliding movement until actuated by the key. The pivoted tumblers 31 are normally urged in the direction of the tumblers 25 by a leaf spring 33 secured to the bracket 24:. The pivoted tumblers 31 are provided with edge elements 34 to engage a tumbler 35 pivoted to ears 36 on the frame 6 for the purpose of holding the tumblers 31 against pivotal movement or away from the tumblers 25. The tumblers 31 are provided with key engaging faces 36 adapted to be engaged by the bit of the key for retracting or pivoting the plungers 31 out of engagement with the plungers 25. The tumbler 35 comprises an elongated head 33 provided at one end with an angle iron shaped element 39 adapted to engage behind the free ends of the tumblers 31 to pre vent pivotal movement of said tumblers until the tumbler 35 is actuated by the key. A shank 40 is formed on the head 38 of the tumbler 35 and is provided with a curved key engaging face d1 disposed slightly in advance of the key engaging faces of the tumblers 31 so that on the initial movement of the key, the bit thereof engages the face 41 to rock the tumbler 35 on its pivot and disengage the element 39 from the tumblers 31. The element 39 is engaged by a leaf spring 42 carried by th frame 6 for normally urging the tumbler 35 into a position to lock the tumblers 31 against pivotal movement. It is to be understood that the tumblers 31 and 35 operate through slots in the member 9 of the frame 6.

Figure 5 shows the various tumblers positioned to free the plunger and the latter also is shown in a retracted position by the influence of the spring 23. Figure 3 shows said parts in a locked position for holding the plunger in the opening 11 of the casing and traversing the slot 2.

In operation, with the control lever B positioned so that the eye C is disposed in the casing 1 by way of the slot 2, the finger piece 21 is pressed causing the plunger to traverse the slot 2 and pass through the eye C and into the open ing 11. As the plunger frame 14 moves into the stated position the sliding tumblers 25 move transversely of the plunger plate so as to become positioned behind the shoulder 19 looking the plunger against being withdrawn from the eye C and the opening 11 of the casing. The sliding tumblers 25 move into the stated position when the shoulder 19 moves out of the notches 27 by the influence of the spring 26. As the tumblers 25 move into locking position, the springs 33 and 42 urge the tumblers 31 and 35 into locking position. It is to be understood that the projections '32 of the tumblers 31 move into the notches 30 of the tumblers 25 and lock the latter against sliding movement while the element 39 of the tumbler 35 moves into engagement with the tumblers 31 and locks the latter against pivotal move- 'ment; thus, it will be seen that the plunger 13 is efliciently locked in a position to secure the operating lever 13 against pivotal movement.

To free the lever B, a key is inserted through the keyhole onto the guide 17 and by rotating the key in the proper direction, the bits thereof engage the faces 23 of the tumblers 25 causing the latter to slide bringing the notches 27 thereof into alignment with the shoulder 19. The shoulder being in alignment with the notches 27, the plunger 13 is then free to move under the influence of the spring 23 into a retracted or unlocked position, freeing the operating lever B of the switch stand A. Prior to the key operating the tumblers 25, the bits thereof rock the tumbler 35 on its pivot and a further movement of the key rocks the tumblers 31 on their pivots freeing the projections 32 from the notches 30 of the tumblers 25 so that on a further movement of the key the tumblers 25 will be slid to bring the notches 27 in alignment with the shoulder 13 and permit the plunger to move into unlocked position.

A key guard 43 is carried by the plunger frame 1 1 and when the plunger is in an unlocked or retracted position, the guard intercepts the path of the key consequently preventing the key from being withdrawn from the casing 1 when the lock or plunger is in an unlocked position. To move the plunger into locking position it is only necessary to press upon the finger piece 21 and as soon as the shoulder 19 moves out of the notches 27 the tumblers 25 slide into a position to engage behind the shoulders 19 and the tumblers 31 and 35 move into locking position.

A cover or guard 44 is pivoted to the casing 1 and is adapted to be swung into a position to overlie the finger piece 21 and also the keyhole for the purpose of preventing weather elements from entering the interior of the casing and affecting the parts therein.

A leaf spring 415 is secured in the casing and is adapted to bear against the end of the operating lever B when the latter is disposed within the casing and with the plunger extending through the eye C thereof for the purpose of preventing the lever B from pivoting slightly or moving relative to the plunger, consequently obviating undue noise.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of my invention, as claimed.

Having thus described my invention, what I claim is:

1. A look including a casing and a spring pressed plunger self movable into an unlocking position, a finger piece for moving the plunger into a looking position, slidably mounted and spring pressed tumblers for holding the plunger in looking position when said plunger is moved into the stated position, spring pressed pivoted tumblers for looking the sliding tumblers in the stated position, and means for locking the pivoted tumblers in the stated position until said tumblers and means are acted upon by a key.

2. A look including a casing and a spring pressed plunger self movable into an unlocking position, a finger piece for moving the plunger into a looking position, slidably mounted and spring pressed tumblers for holding the plunger in looking position when said plunger is moved into the stated position, spring pressed pivoted tumblers for lock ing the sliding tumblers in the stated position, and a pivoted spring pressed tumbler to lock the first named pivoted tumblers in the stated position until said tumblers are acted upon by a key.

3. A look of the class described comprising a casing, a guided slidable member in said casing, a

locking bolt on said member, a spring acting on said member to withdraw the bolt from the locking position, a projection on said slidable member extending outside of said casing, a finger piece on said projection adapted for moving said bolt into member, guideways for said bolt in said casing, a. spring on said bolt acting to hold said bolt in the unlocked position, a. projecting element on said slidable member adapted to extend through the wall of said casing, a finger piece on said element adapted to be pressed in to throw said bolt in the locking position, slidable spring pressed tumblers for holding said bolt in the locking position, spring pressed and pivoted tumblers for holding said slidable tumblers in the locked position, and means for locking the pivoted tumblers in the locked position of the bolt until said tumblers and means are acted on by a key.

CHARLES NEWTON COX. 

